Kaon production in Au+Au collisions at [Formula Presented]

L. Ahle, Y. Akiba, K. Ashktorab, M. D. Baker, D. Beavis, H. C. Britt, J. Chang, C. Chasman, Z. Chen, C. Y. Chi, Y. Y. Chu, V. Cianciolo, B. A. Cole, H. J. Crawford, J. B. Cumming, R. Debbe, J. C. Dunlop, W. Eldredge, J. Engelage, S. Y. FungE. Garcia, S. Gushue, H. Hamagaki, L. F. Hansen, R. S. Hayano, G. Heintzelman, E. Judd, J. Kang, E. J. Kim, A. Kumagai, K. Kurita, J. H. Lee, J. Luke, Y. Miake, A. Mignerey, B. Moskowitz, M. Moulson, C. Muentz, S. Nagamiya, M. N. Namboodiri, C. A. Ogilvie, J. Olness, L. P. Remsberg, H. Sako, T. C. Sangster, R. Seto, J. Shea, K. Shigaki, R. Soltz, S. G. Steadman, G. S.F. Stephans, M. J. Tannenbaum, J. H. Thomas, S. Ueno-Hayashi, F. Videbaek, F. Wang, Y. Wu, H. Xiang, G. H. Xu, K. Yagi, H. Yao, W. A. Zajc, F. Zhu

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Abstract

A systematic study of the spectra and yields of [Formula Presented] and [Formula Presented] is reported by experiment E866 as a function of centrality in Au+Au collisions at [Formula Presented] The invariant transverse spectra for both kaon species are well described by exponentials in [Formula Presented] with inverse slope parameters that are largest at midrapidity and which increase with centrality. The inverse slopes of the [Formula Presented] spectra are slightly larger than the inverse slopes of the [Formula Presented] spectra. The kaon rapidity density peaks at midrapidity with the [Formula Presented] distribution wider in rapidity than [Formula Presented] The integrated total yields of [Formula Presented] and [Formula Presented] increase nonlinearly and steadily with the number of projectile participants. The yield per participant for kaons is two to three times larger than the yield from [Formula Presented] collisions. This enhancement suggests that the majority of kaons in central Au+Au reactions are produced in secondary hadronic collisions. There is no evidence for an onset of additional kaon production from a possible small volume of baryon-rich quark-gluon plasma. The differences between [Formula Presented] and [Formula Presented] rapidity distributions and transverse spectra are consistent with a lower phase space for [Formula Presented] production due to a higher energy threshold. These differences also exclude simple thermal models that assume emission from a common equilibrated system.

Original languageEnglish
Pages (from-to)3523-3538
Number of pages16
JournalPhysical Review C - Nuclear Physics
Volume58
Issue number6
DOIs
Publication statusPublished - 1998 Jan 1

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Ahle, L., Akiba, Y., Ashktorab, K., Baker, M. D., Beavis, D., Britt, H. C., Chang, J., Chasman, C., Chen, Z., Chi, C. Y., Chu, Y. Y., Cianciolo, V., Cole, B. A., Crawford, H. J., Cumming, J. B., Debbe, R., Dunlop, J. C., Eldredge, W., Engelage, J., ... Zhu, F. (1998). Kaon production in Au+Au collisions at [Formula Presented]. Physical Review C - Nuclear Physics, 58(6), 3523-3538. https://doi.org/10.1103/PhysRevC.58.3523